The MP5K is a sub machine gun featured in Call of Duty: Black Ops, and also confirmed to appear in the upcoming Call of Duty: Modern Warfare 3. In real life, the MP5K is the short variant of the Heckler and Koch MP5 submachine gun. It was introduced in 1976, actually after the events of Black Ops; however, prototypes of the weapon existed long before it's true introduction and therefore the weapon featured in the game might, like several of the others, be modelled on a prototype.

It is fully automatic and has a fair amount of recoil. It is mostly effective at close range due to having low accuracy but can also be used at medium or long range if shot in bursts. In multiplayer, it is unlocked from rank 1.

As with all primary weapons from Black Ops, various camouflages can be bought for this gun for 250 COD points each. You can choose a custom reticle for 500 points and then change the colour of it for 250 points. The lens colour can also be changed for a further 500 points. You can have your Clan Tag and Emblem engraved into the gun for 1000 points each.